A Precise Water Abundance Measurement for the Hot Jupiter WASP-43b

Abstract

The water abundance in a planetary atmosphere provides a key constraint on the planet's primordial origins because water ice is expected to play an important role in the core accretion model of planet formation. However, the water content of the Solar System giant planets is not well known because water is sequestered in clouds deep in their atmospheres. By contrast, short-period exoplanets have such high temperatures that their atmospheres have water in the gas phase, making it possible to measure the water abundance for these objects. We present a precise determination of the water abundance in the atmosphere of the 2 $M_{\mathrm{Jup}}$ short-period exoplanet WASP-43b based on thermal emission and transmission spectroscopy measurements obtained with the Hubble Space Telescope. We find the water content is consistent with the value expected in a solar composition gas at planetary temperatures (0.4-3.5x solar at 1 $\sigma$ confidence). The metallicity of WASP-43b's atmosphere suggested by this result extends the trend observed in the Solar System of lower metal enrichment for higher planet masses.

Accepted to ApJL; this version contains three supplemental figures that are not included in the published paper. See also our companion paper "Thermal structure of an exoplanet atmosphere from phase-resolved emission spectroscopy" by Stevenson et al

References in corpus (10)

• Detection of Carbon Monoxide and Water Absorption Lines in an Exoplanet Atmosphere
• Atomic and Molecular Opacities for Brown Dwarf and Giant Planet Atmospheres
• Water Vapor in the Spectrum of the Extrasolar Planet HD 189733b: 1. the Transit
• Strong Water Absorption in the Dayside Emission Spectrum of the Planet HD 189733b
• The Atmospheric Signatures of Super-Earths: How to Distinguish Between Hydrogen-Rich and Hydrogen-Poor Atmospheres
• H2O abundances in the atmospheres of three hot Jupiters
• Methane on Uranus: The case for a compact CH4 cloud layer at low latitudes and a severe CH4 depletion at high-latitudes based on re-analysis of Voyager occultation measurements and STIS spectroscopy
• From stellar nebula to planetesimals
• Measuring Jupiter's water abundance by Juno: the link between interior and formation models
• Composition of Ices in Low-Mass Extrasolar Planets

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